Spraying device



Dec. 2, 1941. J. M. HOTHERSALL SPRAYING DEVICE\ Filed Ndv. 22, 1938 ATTORNEY Patented Dec..2, 1941 sraarmo nnvron John M. Hothersall, Brooklyn N. in,

American Can Company, corporation New Jersey minor to New York, N. Y., a

Application November 22,1938, Serial No. 241,844 5 Claims. (crass-s9 The-present invention relates to a spraying device for liquid insecticide cans or the, like and has particular" reference to an improved and simplified arrangement and construction of parts which insures a continuous spray of better proportions than heretobefore obtained.

An object of the invention is the provision of an air operated spraying device for liquid insecticide cans or the like wherein the" same air which is introduced into the can to create a pressure on the liquid therein is also used to to provide abundant space around them for maintaining an ample supply of air and liquid adjacent the point of discharge so that a full and continuous spray is alwaysobtained.

Another object is the provision in a spraying device of this character of air and liquid tubes having a rectangular cross section which permits case 01' construction, the tubes being made from flat sheet or strip stock instead of being molded or extruded thereby providing more compactness with the advantage of conveying more air and liquid in a closer space.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawing, discloses a preferred embodiment thereof.

Referring to the drawing:

Figure 1 is a side elevation of a can having a spraying device attached thereto and embodying the instant invention, parts being broken away;

Fig. 2 is a front elevation of the can and spraying device illustrated in Fig. 1, the viewpoint being taken substantially from a vertical plane indicated as to position by the lines 22 in that figure;

Fig. 3 is an enlarged sectional view taken substantially along the vertical sectional line 3-3 in Fig. 2, with parts broken away: and

Figs. 4 and 5 are sectional details taken substantially along the horizontal lines 4.4 and 5-5, respectively, in Fig. 3.

A a preferred embodiment of the inv ntion the drawing illustrates a spraying device H attached to a liquid containing sheet metal can I2 having a body member l3 preferably of rectangular or elongatedcross section. Such a body member is provided with oblong top and bottom closure members It secured thereto by suitable seams IS. The top member is formed with an upright neck portion l6 having at its upper edge an inwardly extending flange IT. This neck -'is preferably located at one end of the oblong top member adjacent its provided in its side wall threads [8.

The spraying device II is preferably shaped in the manner 01' a gun to facilitate handling and operation. This spraying device includes a flat base member 22 the longitudinal edges of which are interfoldcd in a seam 23 with similar edges of an arch shaped cover 24. The cover merges into an angularly disposed hollow handle 25 which resembles the handle of a gun.

The side walls of the arch'shaped cover and the hollow handle are strengthened and tied together by a tubular sheet metal rivet 26 which extends transversely of the cover. When the spraying unit is on the can it' extends back over the can top with the handle portion 25 hanging down adjacent the side wall of the can body in a convenient holding position.

The spraying device may be readily attached to a can of liquid by means of a screw cap 3| which issecured in the base member 22.. This cap'is formed with a top section 32 which merges into a depending side wall section 33 having screw threads 34 formed therein for cooperation with 'thescrew threads l8 in the can neck portion l6 when the spraying device is screwed onto the neck of the can. A gasket 35 in the top of the cap seats against the neck flange l1 and provides an air tight joint between neck and cap.

Dispensing of the liquid in a spray from the can is effected by way of a flattened air tube ll (Figs. 3, 4 and 5) and an adjacent flattened liquid tube 42. The flat sides of the tubes are parallel and both are carried in the spraying device cap 3|.

end seam i5 and is section 'with screw cover 24. 1

The air tube 4| projects down inside the cap only a short distance, its lower end being open and in communication with the interior of the can above the liquid. The liquid tube 42 is also open at itslower end and this tube extends down into the liquid terminating adjacent the bottom of the can in spaced relation therewith? The upper ends of these tubes are closed and both project above the canto-a position adjacent the inside top of the arch projection stream of liquid arrives These two tubes 4:. one integral unit from 42 are preferably made in fiat strip sheet metal and include an outer wall section 43, an intermediate wall section 44, and an inner wall section 4l These wall sections are preferably straight, the marginal edges of the outer and'the inner wall sections being, bent inwardly at an angle to pro;-

-vide bevel wall portions 40 when viewed in cross sectio Thus when the three wall sections are placed side by side there stantially rectangular and longitudinally parallel enclosures which constitute the air tube 4| and the liquid tube 42. These wall sections are united strict or reduce the area of the tube in this section. This reduced portion of the side wall is formed with an outwardly extended cone-like having an orifice 52 ,at the apex of the cone. This constitutes the outer spray discharge orifice of the device.

In a similar manner the intermediate wall section 44 is formed with an outwardly extended cone shaped projection 54 having an orifice 55 formed at the apex of the cone. This constitutes an inner air orifice. The second projection 54 is located directly opposite to or is aligned with projection BI and extends into and in spaced relation thereto.

The inner wall 45 is formed with a'check valve 51 which is preferably in direct alignment with the orifices 52, 55. This check valve includes a tubular housing 58 which encloses a compression spring 59 and a check ball valve 6!. One end of the housing is secured to the fiat wall 45. Its opposite end is reduced in diameter as at 82 to provide a seat for the spring pressed ball 8|. This reduced end of the housing merges into an air supply pipe 83 the arch cover 24 and is connected to a rubber hand bulb 65 which is retained in the hollow handle portion 25, a portion of the bulb being exposed for manipulation by the hand as it grips the handle. The bulb is also provided with a check valve 66.

Hence when the bulb is repeatedly squeezed as in ordinary operation of the gun, air is pumped through supply pipe 63 and check valve 51 into the air tube 4|. The greater quantity of this air issues from the bottom of the: tube and enters the can where it builds up and creates a pressure on the liquid contained in the can. However, some of the air goes straight on out through the air orifice 55 and thence through the spray The built up pressure in the can forces the liquid up into the liquid tube 42 where it is reduced to a thin section as it comes into the constricted area of the tube. This thin adjacent the spray orifice B2, flowing toward it from all sides. The constricted section of the tube creates a counter-pressure on the liquid slowing down its fiowing action while further increasing the pressure in the can. i

Thus when this liquid under pressure in the tube 42 meets the stream of air also under pressure issuing from the air orifice 55, the liquid which extends back through 10 are formed two adjacent subis immediately discharged from the spray orifice as a mist of finely divided liquid particles. As long as there is a pressure on the liquid in the can the spray will continue to be ejected. Since the spray and air orifices are only minute in diameter only a slow repeated contraction of the hand bulb is necessary to keep the spray flowing smoothly and very little effort is needed to hold the desired can pressure.-

Provision is made for preventing any drip from the spray from gathering on top of the can where it will be under the spraying device and difilcult to remove without detaching the device from the can. For this purpose a recessed end member 1| is secured, in the outer end of the arch cover 24. The recessed portion of this end member extends back into engagement with the outer wall section 43 of the liquid tube 42 and is provided with a clearance opening 12 for the spray orifice projection 5|.

The lower marginal portion of the end member is bent outwardly at right angles and then upwardly at an angle into engagement with itself, terminating just below the recess and producing a deflecting shoe or apron 14. This element projects just beyond the top end seam of the can and thus deflects any possible drip away from the can top. Any stray drip should there be any will run down on the side of the can where it is readily seen and easily wiped off.

It is'thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the.

' said cap and extending down into the liquid in the can, said liquid tube extending above said cap and having a minute spray orifice therein, an air tube also in said cap and in communication with the interior of the 'can above the liquid, said air tube extending above said cap and having a wall portion thereof indented into said liquid tube and provided with a minute air orifice directedtoward said spray orifice and in communication with said liquid tube, and means connected to said air tube for pumping air thereinto, said air creating a pressure on the liquid and forcing the same into said liquid tube adjacent said spray orifice, the same air also issuing from said air orifice into said filled liquid tube and forcing the liquid through said spray orifice in a continuous spray of finely divided liquid particles.

2. A spraying device for a liquid insecticide can and the like, comprising a cap adapted to be secured in an air tight joint to a can containing a liquid to be dispensed, a tube unit in said cap extending above and below said cap, said tube unit including a liquid tube having oneend submerged in said liquid and its opposite and above said cap closed, an air tube disposed adjacent said liquid tube and having its upper end closed and projecting above said cap, said liquid tube above said cap having a spray orifice and said air tube having .a wall portion thereof projecting into said iiquidtube provided with an orifice means for pumping air into said air tube to create a pressure on the liquid and to cause a rising of the liquid to the spray orifice in said liquid tube and also to create a jet of air issuing from said air orifice and impinging against the liquid adjacent said spray orifice, thereby ejecting from said spray orifice a continuous spray of finely divided liquid particles.

3. A spraying device for a liquid insecticide can and the like, comprising a cap adapted to be secured in an air tight joint to a can containing a liquid to be dispensed, a tube unit in said cap extending above and below said cap, said tube unit including a plurality of sheet metal strips arranged in spaced relation and having their longitudinal edges interfolded in side seams holding the strips together and forming a unitary structure having a multitubular cross section setting ofi a liquid tube in one portion of said structure and an air tube in a parallel and adjacent portion of said structure, the lower ends of said tubes extending into the can where the liquid tube terminates in the liquid and the air tube terminates above the liquid, the upper ends of said tubes extending above said cap provided respectively with outwardly projecting wall portions nesting within each other, said projecting wall portions being provided respectively with registering spray and air orifices, and means connected to said air tube for pumping air thereinto to create a pressure on the liquid in the can and to force the same into said liquid tube to adjacent said spray orifice, said air also issuing from said air orifice into said filled liquid tube and forcing the liquid through said spray orifice in a continuous spray of finely divided liquid particles.

4. A spraying device for a liquid insecticide can and the like, comprising a cap adapted to be secured to an end of a can containing a liquid to be dispensed, a tube unit in said cap including a liquid tube and an air tube extending below said cap and into said can and also extending above said cap, said liquid tube above said cap having a spray orifice, a wall portion of said air tube projecting into said liquid tube and provided with an air orifice directed toward said liquid spray orifice, means connecting with said air tube for creating an air pressure in said can while simultaneously blowing air through said orifices, thereby ejecting from said liquid orifice the liquid in said can in a continuous spray of finely divided liquid particles, and an apron member disposed adjacent said spray orifice for deflecting spray drip from the top of said can so that the latter may be maintained free of liquid.

5. A spraying device for a liquid insecticide can and the like, comprising a base member, a screw cap secured in said base member for screwing said spraying device onto a cooperating part of said can, an arch cover over said base mem-' her and said cap, said arch cover extending back over the can when the device is secured thereto, a hollow gun like handle formed integrally with said arch cover, a tube unit in said cap including a liquid tube and an air tube extending below said cap and into said can and also extending above said cap, said liquid tube having a spray orifice and said air tube having a wall portion thereof projecting into said liquid tube and provided with an orifice directed toward said liquid spray orifice, and a rubber hand bulb and air supply pipe housed within said handle and connected to said air tube for creating an air pressure in said can while simultaneously blowing air through both of said orifices, thereby electing from said liquid orifice the liquid in said can in a continuous spray of finely divided liquid particles.

JOHN M. HO'IHERSAIL. 

